1,720,966 research outputs found
Detection of Maedi Visna Virus (MVV) by immunohistochemistry and PCR in experimentally infected sheep.
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Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Small ruminant lentivirus and Mycobacterium avium subsp. Paratuberculosis: Co-infection prevalence and preliminary investigation on genetic resistance to both infections in a garfagnina goat flock
Full text linkSmall ruminant lentiviruses (SRLVs) are a heterogeneous group of viruses of sheep, goats and wild ruminants, causing persistent infection and responsible of chronic degenerative disease of joints, lungs, udder and central nervous system in small ru-minants. Mycobacterium avium subsp. paratuberculosis (MAP) is also a major production-limiting disease, which causes a chronic infection of ruminants. The disease causes persistent diarrhea, progressive weight loss, debilitation, anemia, and even-tually death. Both SRLVs and MAP are widespread in small ruminants in many countries. The aim of this study was to esti-mate the prevalence of SRLVs and MAP co-infection in a Garfagnina goat flock consisting of 269 females and 20 males and lo-cated in Garfagnana district (Tuscany, Italy). All adult females were tested for MAP and SRLVs infection. Thirty-six out of 269 animals in total resulted positive for one or both infections. A total of 27 goats (10%) were positive to MAP and 21 goats (7.8%) were positive to SRLV. The apparent prevalence of co-infection was 4.5%, counting 12 goats positive for both infections. No significant association was found between subjects seropositive to SRLV and MAP. To investigate possible genetic influences on susceptibility or resistance of goats for both disease, all co-infected animals were compared with no infected animals (control group, 12 goats). Blood samples were collected and 12 STR markers (MAF65, SRCRSP5, INRA023, MCM527, CSRD247, SR-CRSP23 OarFCB20, TGLA53, INRA005, INRA063, ETH10, ILSTS87) were investigated. For each marker, allele and genotypes frequencies between the two groups of animals were compared using the chi-square test and Fisher’s exact tests. No statistical differences in STR alleles or genotypes frequency were observed between healthy animals and co-infected animals. Future works may include replication of this study with a larger number of animals to try to identify candidates genes for the genetic resistance to both infections
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Genome scan for the possibility of identifying candidate resistance genes for goat lentiviral infections in the Italian Garfagnina goat breed
No full textSmall ruminant lentiviruses (SRLVs) are a heterogeneous group of viruses of sheep, goat, and wild ruminants responsible of lifelong persistent infection leading to a multisystem chronic disease. Increased evidences indicate that host genetic factors could influence the individual SRLV resistance. The present study was conducted on the Garfagnina goat breed, an Italian goat population registered on the Tuscan regional repertory of genetic resources at risk of extinction. Forty-eight adult goats belonging to a single flock were studied. SRLV diagnosis was achieved by serological tests and 21 serologically positive animals were identified. All animals were genotyped with the Illumina GoatSNP60 BeadChip and a genome-wide scan was then performed on the individual marker genotypes, in an attempt to identify genomic regions associated with the infection. One SNP was found significant (P < 5 × 10 −5 ) on CHR 18 at 62,360,918 bp. The SNP was an intron of the zinc finger protein 331 (ZNF331) protein. In the region 1 Mb upstream the significant SNP, the NLRP12 (NLR family pyrin domain containing 12), the PRKCG (protein kinase C gamma), and the CACNG7 (calcium voltage-gated channel auxiliary subunit gamma 7) were found
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Infezione sperimentale da Maedi Visna Virus: osservazioni anatomo-istopatologiche ed immunoistochimiche in pecore dopo tre anni dall'inoculazione
No full textDispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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